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linked data semantic web 2014 eswc information retrieval evaluation index structures distribution schemex profiles index index models reveal lod web mining billion triple challenge npql liteq programming iswc semantic web challenge lodatio redundancy entropy analysis btc schema information lugano 2012 focused exploration linked data analysis data analysis applications summer school irss linked open data dynamic data evolving data perplexity stability github metrics change dynamics twitter social media workshop smoothing rdf sampling